Re: Sounds familiar...
You set up exclusions?
Why would you do something as evil as that?
You should set up dummy reservations, and write in the comment why it's reserved.
(Unless you ran a DHCP server where you could add a comment to exclusions, of course. )
Exclusions tends to stick around a long time after the device is retired. And without a good comment or other documentation, no one will dare removing it.